Huxley, Professor, [67]-[69], [71], [72], [95], [103], [109], [130], [131], [137], [141], [163], [172], [173], [231], [247], [273].
Hybrids, mortality of, [124].
Hydrocyonina, [146].
Hyperphysical action, [253].
Hyrax, [179].
I.
Ichthyopsida, [109].
Ichthyosaurus, [78], [106], [132], [177].
Ichthyosis, [183].
Iguanodon, [71].